1 #ifndef Py_DICT_COMMON_H 2 #define Py_DICT_COMMON_H 3 4 typedef struct { 5 /* Cached hash code of me_key. */ 6 Py_hash_t me_hash; 7 PyObject *me_key; 8 PyObject *me_value; /* This field is only meaningful for combined tables */ 9 } PyDictKeyEntry; 10 11 /* dict_lookup_func() returns index of entry which can be used like DK_ENTRIES(dk)[index]. 12 * -1 when no entry found, -3 when compare raises error. 13 */ 14 typedef Py_ssize_t (*dict_lookup_func) 15 (PyDictObject *mp, PyObject *key, Py_hash_t hash, PyObject ***value_addr, 16 Py_ssize_t *hashpos); 17 18 #define DKIX_EMPTY (-1) 19 #define DKIX_DUMMY (-2) /* Used internally */ 20 #define DKIX_ERROR (-3) 21 22 /* See dictobject.c for actual layout of DictKeysObject */ 23 struct _dictkeysobject { 24 Py_ssize_t dk_refcnt; 25 26 /* Size of the hash table (dk_indices). It must be a power of 2. */ 27 Py_ssize_t dk_size; 28 29 /* Function to lookup in the hash table (dk_indices): 30 31 - lookdict(): general-purpose, and may return DKIX_ERROR if (and 32 only if) a comparison raises an exception. 33 34 - lookdict_unicode(): specialized to Unicode string keys, comparison of 35 which can never raise an exception; that function can never return 36 DKIX_ERROR. 37 38 - lookdict_unicode_nodummy(): similar to lookdict_unicode() but further 39 specialized for Unicode string keys that cannot be the <dummy> value. 40 41 - lookdict_split(): Version of lookdict() for split tables. */ 42 dict_lookup_func dk_lookup; 43 44 /* Number of usable entries in dk_entries. */ 45 Py_ssize_t dk_usable; 46 47 /* Number of used entries in dk_entries. */ 48 Py_ssize_t dk_nentries; 49 50 /* Actual hash table of dk_size entries. It holds indices in dk_entries, 51 or DKIX_EMPTY(-1) or DKIX_DUMMY(-2). 52 53 Indices must be: 0 <= indice < USABLE_FRACTION(dk_size). 54 55 The size in bytes of an indice depends on dk_size: 56 57 - 1 byte if dk_size <= 0xff (char*) 58 - 2 bytes if dk_size <= 0xffff (int16_t*) 59 - 4 bytes if dk_size <= 0xffffffff (int32_t*) 60 - 8 bytes otherwise (int64_t*) 61 62 Dynamically sized, 8 is minimum. */ 63 union { 64 int8_t as_1[8]; 65 int16_t as_2[4]; 66 int32_t as_4[2]; 67 #if SIZEOF_VOID_P > 4 68 int64_t as_8[1]; 69 #endif 70 } dk_indices; 71 72 /* "PyDictKeyEntry dk_entries[dk_usable];" array follows: 73 see the DK_ENTRIES() macro */ 74 }; 75 76 #endif 77
